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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  GT seat post ID
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Offline Mikku

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GT seat post ID
« on: March 16, 2015, 03:01 AM »
Hi guys! Can anyone shed any light on the timeline for 80s' GT posts as I'm getting confused with the different decals and stamping!! :crazy2:

Thanks in advance.

Mick :)
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rodriguez

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Re: GT seat post ID
« Reply #1 on: March 16, 2015, 12:34 PM »
pre 84 unstamped like the bars

84-89 stamped GT (side by side logo) 4130 and baseball symbol

89-oblivion stamped GT (vertical logo) cr-mo
« Last Edit: March 16, 2015, 01:27 PM by rodriguez »
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Offline Mikku

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Re: GT seat post ID
« Reply #2 on: March 16, 2015, 01:33 PM »
Brilliant info - just what I needed, thanks!  :daumenhoch:
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Offline BMX1973

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Re: GT seat post ID
« Reply #3 on: March 16, 2015, 09:57 PM »
Is this the same for bars? Do they all have knurling?  :daumenhoch:

Sorry Mikku don't mean to thread hijack!  :-[  :)

Quote from: rodriguez on March 16, 2015, 12:34 PM
pre 84 unstamped like the bars

84-89 stamped GT (side by side logo) 4130 and baseball symbol

89-oblivion stamped GT (vertical logo) cr-mo
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Offline That Swan Guy

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Re: GT seat post ID
« Reply #4 on: March 16, 2015, 11:31 PM »
Quote from: BMX1973 on March 16, 2015, 09:57 PM
Is this the same for bars? Do they all have knurling?  :daumenhoch:

Sorry Mikku don't mean to thread hijack!  :-[  :)

Quote from: rodriguez on March 16, 2015, 12:34 PM
pre 84 unstamped like the bars

84-89 stamped GT (side by side logo) 4130 and baseball symbol

89-oblivion stamped GT (vertical logo) cr-mo

No basically. Early bars had neither a stamp nor knurling. The shape, size and cross bar width determines an early set of GT Pro bars.
they eventually got stamped and knurled. then the cross bar became oval and blimey it was the 90s.  :LolLolLolLol:

Shape and size is the big give away for GT Pro bars :daumenhoch:
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Offline Mikku

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Re: GT seat post ID
« Reply #5 on: March 17, 2015, 01:22 PM »
Quote from: BMX1973 on March 16, 2015, 09:57 PM
Is this the same for bars? Do they all have knurling?  :daumenhoch:

Sorry Mikku don't mean to thread hijack!  :-[  :)

No worries! It's great to share all this info. :daumenhoch:

I've always wondered when the knurling was introduced on the GT bars (and Powerlite bars, for that matter)!
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Offline eddie kidd

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Re: GT seat post ID
« Reply #6 on: March 17, 2015, 02:40 PM »
I have 3 lay backs and they all have different stamps, different lengths and different angles...





(I know the one on the left is from the 90's , but I like the stamp)...

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rodriguez

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Re: GT seat post ID
« Reply #7 on: March 17, 2015, 04:01 PM »
Never seen the GT stamp on the left before Eddie   :coolsmiley:

The two posts on the right are probably both foreign, if they don't have the baseball stamp they'd be made in Taiwan I'd guess, different factories would explain the shapes.
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Offline That Swan Guy

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Re: GT seat post ID
« Reply #8 on: March 17, 2015, 04:52 PM »
The angle of the middle one is not typical of a GT post, probably a copy.
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Offline eddie kidd

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Re: GT seat post ID
« Reply #9 on: March 17, 2015, 10:38 PM »
It's not quite fully laid back , more semi...



But it's very thick walled...
Would make a good rider...

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Offline That Swan Guy

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Re: GT seat post ID
« Reply #10 on: March 18, 2015, 07:46 AM »
Probably last longer than the original ones  :LolLolLolLol:
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Offline BMX1973

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Re: GT seat post ID
« Reply #11 on: March 18, 2015, 08:42 AM »
Where would the baseball symbol be, at the base?  :-\

I know it can be confusing with the seat posts as there were a lot of fakes around a few years back!  >:(

Quote from: rodriguez on March 17, 2015, 04:01 PM
Never seen the GT stamp on the left before Eddie   :coolsmiley:

The two posts on the right are probably both foreign, if they don't have the baseball stamp they'd be made in Taiwan I'd guess, different factories would explain the shapes.
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Offline BMX1973

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Re: GT seat post ID
« Reply #12 on: March 18, 2015, 08:45 AM »
Must be confusing with the unknurled and unstamped bars.  :-[ Bit like SE bars.  :-\

Best get stamped ones then.  :daumenhoch:

 
Quote from: That Swan Guy on March 16, 2015, 11:31 PM
Quote from: BMX1973 on March 16, 2015, 09:57 PM
Is this the same for bars? Do they all have knurling?  :daumenhoch:

Sorry Mikku don't mean to thread hijack!  :-[  :)

Quote from: rodriguez on March 16, 2015, 12:34 PM
pre 84 unstamped like the bars

84-89 stamped GT (side by side logo) 4130 and baseball symbol

89-oblivion stamped GT (vertical logo) cr-mo

No basically. Early bars had neither a stamp nor knurling. The shape, size and cross bar width determines an early set of GT Pro bars.
they eventually got stamped and knurled. then the cross bar became oval and blimey it was the 90s.  :LolLolLolLol:

Shape and size is the big give away for GT Pro bars :daumenhoch:
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Offline BMX1973

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Re: GT seat post ID
« Reply #13 on: March 18, 2015, 12:14 PM »
 :)

Quote from: tfi_friday on March 18, 2015, 10:43 AM
Quote from: BMX1973 on March 18, 2015, 08:42 AM
Where would the baseball symbol be, at the base?  :-\

My 1985 post is like this:

    GT
    CA
CR-MO 4130



Then at the lower part of the post at the insert line you'll see the baseball symbol

 ------------
   INSERT
 THIS LINE
   JAPAN @

"@" is a baseball symbol.


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Offline Mikku

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Re: GT seat post ID
« Reply #14 on: April 14, 2015, 12:07 PM »
Thanks for the info and photos on this one guys!  :bow:

So taking all the above in account, would it be accurate to amend rodriguez's three-way breakdown as follows:-

pre-84 unstamped = made in California

84-89 stamped GT (side by side logo) 4130 and baseball symbol = made in Japan

post-89 oblivion stamped GT (vertical logo) cr-mo = made in Taiwan
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Offline bobbbbsy

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Re: GT seat post ID
« Reply #15 on: April 14, 2015, 12:22 PM »
Does nt a baseball mean made by koizumi like the decent diamondback frames ?
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rodriguez

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Re: GT seat post ID
« Reply #16 on: April 14, 2015, 12:43 PM »
Quote from: bobbbbsy on April 14, 2015, 12:22 PM
Does nt a baseball mean made by koizumi like the decent diamondback frames ?

It does, they made stuff for a few different brands, including Raleigh too   :daumenhoch:
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Offline Mikku

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Re: GT seat post ID
« Reply #17 on: April 14, 2015, 03:12 PM »
& the "baseball" is the Koizumi logo which derives from one of the kanji (Chinese) characters in the company's name. Ian at Natsukashi has a good piece on this in his website blog.  :daumenhoch:
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Offline bobbbbsy

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Re: GT seat post ID
« Reply #18 on: April 14, 2015, 08:56 PM »
the plot thickens .  8)
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